-21=a-15

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Solution for -21=a-15 equation: 



-21=a-15

We move all terms to the left:

-21-(a-15)=0

We get rid of parentheses

-a+15-21=0

We add all the numbers together, and all the variables

-1a-6=0

We move all terms containing a to the left, all other terms to the right

-a=6

a=6/-1

a=-6

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